Add indexes on current_package_token in Domain*

It just makes it possible to delete allocation tokens, otherwise we need
to do a linear search over the entire Domain and DomainHistory tables if
we ever want to delete something.

Author: gbrodman

db/src/main/resources/sql/flyway.txt

@@ -216,3 +216,5 @@ V215__drop_contact_fks_contacthistory.sql
 V216__drop_contact_fks_domain.sql
 V217__drop_contact_fks_pollmessage.sql
 V218__tld_drop_allowedregistrantcontactids.sql
+V219__domain_history_package_token_idx.sql
+V220__domain_package_token_idx.sql

db/src/main/resources/sql/flyway/V219__domain_history_package_token_idx.sql

@@ -0,0 +1,16 @@
+-- Copyright 2025 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS domainhistory_current_package_token_idx ON "DomainHistory"
+  USING hash(current_package_token);

db/src/main/resources/sql/flyway/V220__domain_package_token_idx.sql

@@ -0,0 +1,16 @@
+-- Copyright 2025 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS domain_current_package_token_idx ON "Domain"
+  USING hash(current_package_token);

db/src/main/resources/sql/schema/nomulus.golden.sql

@@ -1958,6 +1958,13 @@ CREATE INDEX billingrecurrence_billing_recurrence_id_hash ON public."BillingRecu
 CREATE INDEX delegationsignerdata_domain_repo_id_hash ON public."DelegationSignerData" USING hash (domain_repo_id);
 
 
+--
+-- Name: domain_current_package_token_idx; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX domain_current_package_token_idx ON public."Domain" USING hash (current_package_token);
+
+
 --
 -- Name: domain_domain_name_hash; Type: INDEX; Schema: public; Owner: -
 --
@@ -2000,6 +2007,13 @@ CREATE UNIQUE INDEX domain_no_duplicate_active ON public."Domain" USING btree (d
 CREATE INDEX domaindsdatahistory_domain_history_revision_id_hash ON public."DomainDsDataHistory" USING hash (domain_history_revision_id);
 
 
+--
+-- Name: domainhistory_current_package_token_idx; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX domainhistory_current_package_token_idx ON public."DomainHistory" USING hash (current_package_token);
+
+
 --
 -- Name: domainhistory_domain_repo_id_hash; Type: INDEX; Schema: public; Owner: -
 --